導覽列在回應模式下未關閉
所有已新增的庫都已準備好 ''''
<div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
<ul class="navbar-nav mb-2 mb-lg-0">
<li class="nav-item active">
<select class="users" id="users">
<option><a class="nav-link active" href="#">User</a></option>
<option><a class="nav-link active" href="#">Employee</a></option>
<option><a class="nav-link active" href="#">Admin</a></option>
</select>
</li>
</ul>
</div>
</div>
</nav>
```` 
我已經刪除了
<div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">部分，現在您可以在更改解析度時看到下拉式選單。